An adapter assembly configured to install a roof rack accessory to a vehicle is provided. The roof rack accessory may include a vehicle attachment assembly having a fastener and a locking mechanism. In particular, the adapter assembly may comprise a wrench, an adapter, and a driving sleeve. The adapter engaging with the wrench includes an adapter body that includes first and second engagement portions and a driving post that engages the fastener of the vehicle attachment assembly. The driving sleeve may be engageable with the adapter, wherein the locking mechanism of the vehicle attachment assembly is engaged with the driving sleeve while the fastener of the vehicle attachment assembly is engaged with the adapter.